PMID: 11607318Sep 1, 1992Paper

Redox state of a one-electron component controls the rate of photoinhibition of photosystem II

Proceedings of the National Academy of Sciences of the United States of America
L NedbalJ Whitmarsh

Abstract

Photosystem II reaction centers in plants, algae, and cyanobacteria are susceptible to damage by excess light that irreversibly impairs activity and eventually results in the proteolytic degradation of at least one of the core proteins. The sequence of events and underlying molecular mechanisms that lead to photoinhibition are poorly understood. Here we present evidence for a one-electron redox component that exerts strong control over the rate of photosystem II photoinhibition in isolated thylakoid membranes. Monitoring the impact of various doses of visible light on the rate of water oxidation and on the variable chlorophyll fluorescence, we found that reduction of the redox component increased the rate of photoinhibition >15-fold. Anaerobic potentiometric titrations of the rate of photoinhibition revealed a redox component with a midpoint potential near 20 mV at pH 7.5. The titrations fit a Nernst equation for a one-electron reaction and were nearly pH independent. Although we have not yet identified the chemical species being titrated, a likely candidate is lowpotential cytochrome b-559. We believe this observation reveals an electron transfer pathway in photosystem II that functions to protect the reaction center against e...Continue Reading

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Citations

Jan 1, 1995·Photosynthesis Research·G FinazziG Forti
Jul 8, 2010·Journal of Bioenergetics and Biomembranes·Rakesh Kumar SinhaPavel Pospísil
Sep 18, 2001·European Journal of Biochemistry·M RoncelM Losada
Dec 7, 2010·Biochimica Et Biophysica Acta·Marja Hakala-Yatkin, Esa Tyystjärvi
Apr 11, 1997·Biochimica Et Biophysica Acta·S U MetzgerJ Whitmarsh
Aug 26, 2011·Biochimica Et Biophysica Acta·Katherine E Shinopoulos, Gary W Brudvig
Mar 13, 2014·Biochimica Et Biophysica Acta·Fernando GuerreroJosé M Ortega
Nov 18, 2014·Biochemistry·Alexandria Deliz Liang, Stephen J Lippard
Mar 23, 2004·Physiologia Plantarum·María BernalInmaculada Yruela
Oct 3, 1994·FEBS Letters·A R Crofts, C T Yerkes
Oct 7, 2000·The Journal of Biological Chemistry·J Kruk, K Strzalka
May 31, 2001·Plant & Cell Physiology·C Miyake, A Yokota
Aug 29, 2002·Plant & Cell Physiology·Chikahiro MiyakeAkiho Yokota
Oct 24, 2019·Annals of Botany·Alexandrina StirbetGovindjee Govindjee
Aug 1, 1993·Physiologia Plantarum·William A CramerMichel Böttger
Oct 24, 1998·Biochimica Et Biophysica Acta·D H Stewart, G W Brudvig
Mar 8, 2011·Journal of Photochemistry and Photobiology. B, Biology·Pavel Pospíšil

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